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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb4586a7882b5c35755516cd441dcd4cb185c1cc3aed872551b3b545368dbee' 
  AND token = 'iydArbQOjGYJk0owLooL1VAz0D2cxkIz09Qhckf3tVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}